new wheels help with some tires... im lost

ok guys just ordered a set of fuel hostages. 20x10 4.50 bs -24 off set. i cant figure out if i should order a 6in lift bc i already have a 4 in. but idk if i can clear 35s or not, din i thought about puttin 33s back on it like i had when i first done the truck... please help with sugestions. i lost bad.

ima gona try 305 55 20s and see how that does and if i dont like it ill just lift it and put 35s or 38s depends on the lift. do yall recon 305s will fit it dont rub bad right now unless u cut it really deep and get it ina bind.

haha funny man i got a set of 305 55s trail grapps for it but my stupid wheels still aint came in yet im goin crazy. i about ordered a lift for it but decided to wait till i find one i like. and figure out how big.